The invention discloses an environment-friendly biological texture etch solution and an application method thereof, particularly relates to application of the texture etch solution to a solar single
wafer during
processing and manufacturing of a solar
silicon wafer, and belongs to the technical field of preparation of a
monocrystalline silicon solar cell. The application method is characterized by comprising the following steps of: adding a non-ionic surfactant,
sodium citrate,
anhydrous sodium carbonate and deionized water into a cleaned texture etch groove, stirring, and mixing uniformly toprepare the environment-friendly biological texture etch solution; heating the environment-friendly biological texture etch solution to between 75 and 85 DEG C; placing
cut monocrystalline silicon wafers in the environment-friendly biological texture etch solution for
etching reaction after the temperature is completely stable, wherein the reaction time is between 10 and 30 minutes; and taking the
silicon wafers out after texture
etching, placing the
silicon wafers in an
ultrasound tank which is filled with the deionized water, and rinsing for 5 to 15 minutes by
ultrasound. The texture surface with fine, uniform and high-coverage rate pyramids can be obtained after the solar single
wafer is subjected to texture
etching through the texture etch solution, and the
mass difference of the wafer before etching and after etching is between 0.1 and 1.0g.